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Lichenoid dermatitis associated with ICI therapy (LD\u2010ICI) is the most frequently encountered histopathologic type of irAE biopsied by dermatologists. There is frequent clinical and histologic overlap between irAEs and several reactive and neoplastic dermatologic disorders; thus, clinical information is essential. LD\u2010ICI with histologic, immunohistochemical, and molecular features typical of mycosis fungoides (MF) are unique. Here, we report a patient who developed LD\u2010ICI with MF\u2010like morphologic features with monoclonal T\u2010cell receptor gene rearrangement on consecutive biopsies during ICI therapy. The development of monoclonal LD\u2010ICI is important for clinicians and pathologists to recognize in patients receiving ICI therapy.<\/jats:p>","DOI":"10.1111\/cup.13536","type":"journal-article","created":{"date-parts":[[2019,6,29]],"date-time":"2019-06-29T14:19:12Z","timestamp":1561817952000},"page":"872-877","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Lichenoid dermatitis from immune checkpoint inhibitor therapy: An immune\u2010related adverse event with mycosis\u2010fungoides\u2010like morphologic and molecular features"],"prefix":"10.1111","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7899-4138","authenticated-orcid":false,"given":"Michael T.","family":"Tetzlaff","sequence":"first","affiliation":[{"name":"Department of Pathology, Section of Dermatopathology The University of Texas MD Anderson Cancer Center  Houston Texas"},{"name":"Department of Translational Molecular Pathology The 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